Roller brake of crane hoisting mechanism

Abstract

The invention relates to a roller brake of a crane hoisting mechanism. The roller brake comprises a bracket, wherein a roller is arranged at the middle part of the bracket; the outer side of the roller is encircled with two sets of brake shoes; the upper ends of the two sets of brake shoes are both connected with baffle plates; the outer sides of the baffle plates are connected with brake grooves; screw rods are inserted in the middle parts of the brake grooves; the top ends of the screw rods are connected with screw caps; the screw rods are provided with threads in a winding manner; sleeves are arranged in the connecting places of the outer sides of the brake grooves and the screw rods; springs are arranged between the baffle plates and the inner side walls of the brake grooves; the screw rods penetrates through the internals of the springs; a cam is arranged between the two baffle plates; the right end of the cam is connected with a cross bar; the right end of the cross bar is connected with a transmission rod through a rotating shaft; the right side of the transmission rod is connected with a push rod through a rotating handle; a ratchet wheel is fixedly connected with an adjusting rod A convenient for the rotation of the ratchet wheel; and a pawl base is arranged at the outer side of an eccentric shaft, and is hinged with a pawl. The roller brake has the advantages of simple design, convenience for operation, good economy, convenience for assembly and disassembly and stable braking.

Description

technical field [0001] The invention belongs to the technical field of hoisting equipment, and in particular relates to a drum brake of a hoisting mechanism of a crane. Background technique [0002] In the hoisting mechanism of a crane that uses a drum for hoisting, in order to achieve a more accurate lifting effect, braking is often performed on the low-speed shaft, so it is very important to ensure the braking efficiency of the brake. In terms of brakes, the friction plates on the brake shoes rub against the spool shaft during braking to generate a braking torque, which causes the brake shoes to wear over time and causes a gap between the brake shoes and the spool shaft Increase, greater than the normal working gap, at this time, it is necessary to continuously adjust the gap to ensure the braking performance of the brake. The drum brake has a gap adjustment function to increase the practicability of the drum brake. Some brakes have a gap adjustment device, but the structu...

AI Technical Summary

Problems solved by technology

[0002] In the hoisting mechanism of a crane that uses a drum for hoisting, in order to achieve a more accurate lifting effect, braking is often performed on the low-speed shaft, so it is very important to ensure the braking efficiency of the brake. In terms of brakes, the friction plates on the brake shoes rub against the spool shaft during braking to generate a braking torque, which causes the brake shoes to wear over time and causes a gap between the brake shoes and the spool shaft Increase, greater than the normal working gap, at this time, it is necessary to continuously adjust the gap to ensure the braking performance of the brake. The drum brake has a gap adjustment function to increase the practicability of the drum brake. Some brakes have a gap adjustment device, but the structure is complicated , the adjustment is inconvenient, and the specific adjustment and the wear of the brake shoe cannot be observed intuitively. In addition, the sensitivity between the baffle plate and the cam in the brake groove at the upper end of the brake shoe needs to be adjusted as required, but the current brake The adjustment of the mechanism is not convenient enough, so it is necessary to provide a drum brake for the crane lifting mechanism with simple design, convenient operation, good economy, convenient disassembly and assembly, and stable braking.

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